Graphic novels, as a modern form of multimodal narratives, create a complex intersemiotic structure by simultaneously employing two sign systems: verbal and visual. In this narrative form, the interaction between image and text not only possesses aesthetic dimensions but also establishes specific signification mechanisms. This study utilizes Peircean semiotics framework and qualitative content analysis to examine the interaction mechanisms of textual and visual sign systems in Ashkan Rahgozar's graphic novels. The research corpus comprises six volumes of Rahgozar's works: "Arshia" (Volumes 1 & 2), "Tolu'-e Jamshid" (Volumes 1 & 2), and "Ghurub-e Jamshid" (Volumes 1 & 2). Peirce's focus on semiosis and the interaction between signifier and signified through three types of signs provides the analytical framework for this study. Findings indicate that textual and visual codes in Rahgozar's works interact complementarily, creating an integrated structure with multilayered narration. Iconic elements in illustrations, indexical narrative cues in actions, and cultural symbols in text all contribute to creating a coherent visual-narrative experience.